Free tools
DNS propagation checker
Read one record from the zone's own authoritative nameservers and from three public resolvers at once. The authoritative answer is what your users will eventually see; the public resolvers show how far it has spread.
How the authoritative view is found
The tool walks down from the registrable domain to find the zone that actually owns the name — a delegated subdomain has its own nameservers — then asks those servers directly, bypassing every cache. This is the same walk DoDomain uses to verify a customer's records, so a record this page shows as authoritative is a record the connect flow would accept.
Frequently asked questions
What does propagated mean on this page?
That every public resolver which answered returns the same answer set as the zone's authoritative nameservers. The authoritative answer is the thing being propagated, so the tool never calls a record propagated on the strength of public resolvers alone — if the authoritative nameservers cannot be read, it says it could not judge.
Why do the public resolvers show an old value?
Recursive resolvers cache each answer for the record's TTL. After you change a record, a resolver that cached the old value keeps serving it until that TTL runs out — the authoritative view is already correct, and the tool shows both so you can see which is which. Lower the TTL before a planned change to shorten this window.
Which record types can I check?
A, AAAA, CNAME, TXT, MX — the same set the DoDomain connect flow can write and verify. CNAME answers are shown as the target hostname, MX answers as priority and exchange, TXT answers verbatim.
Why is a resolver marked error?
Its lookup did not complete — a timeout, a refusal, or a server failure — so it has no answer to compare. An errored view is never counted as agreeing or disagreeing; the verdict is based only on the views that completed, and says how many that was.
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